ShelfBuddy vs Underlined
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ShelfBuddy
Organize your personal library, track reading progress, and discover new books. Manage your collection, set reading goals, and gain insights into your reading habits. Features include barcode scanning, import options, and detailed statistics.
- Digital bookshelf organization
- Reading progress tracking
- TBR pile management
- Book series tracking
- Reading statistics and insights
- ISBN barcode scanning
- Library import/export
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ShelfBuddy is your digital bookshelf: beautiful, calm and built entirely around reading. Keep track of every book and audiobook you own, are reading, have lent out or still want. Free, with no limit on books. Premium is a one-time purchase, no subscription. YOUR LIBRARY, ORGANIZED Create as many shelves as you like, for example Fantasy, Thrillers or Classics, keep wishlists, and plan what to read next with a reading list. A book may sit on several shelves, and copies marked "collected only" count neither as read nor as unread. Manage genres and tags across all your books at once, and "Edit fields" sets author, genres and tags for several books in one step. Filter your TBR pile by shelf, format, genre, tag or language. BOOKS AND AUDIOBOOKS The overview keeps books and audiobooks apart: audiobooks get their own series, wishlists, loans and statistics. Count them as read if you like, and keep manga and comics separate. BOOK SERIES AT A GLANCE See for every series which volumes you own and which are still missing, and add them to your wishlist or a shelf with one tap. Discover suggests book series and audiobook series picked by your taste, search puts the series you look for first, and you get notified when a new volume is released. RATINGS AND RECOMMENDATIONS Rate your books in quarter stars and see ratings from Thalia and other ShelfBuddy readers alongside. "Popular on ShelfBuddy" shows what the community is reading a lot right now, next to recommendations picked by your taste and "Next in your series". TRACK YOUR READING Reading tracker and reading journal in one: status, start and finish dates, reading progress, notes and quotes, also for books you have read more than once. "Read as" remembers when you read a book as an eBook or a borrowed copy while the print edition stays on your shelf. READING SESSIONS WITH A READING TIMER Start a reading session and the timer runs along. When you're done, enter your page and ShelfBuddy updates your progress and reading pace. Log past reading time after the fact, and start your next session from the home screen, the app icon or a widget, with a Live Activity on the Lock Screen. INSIGHTS: GET TO KNOW YOUR READING HABITS A reading calendar shows which days you read and how much. See the time of day and the weekdays you read most, which genres get most of your reading time, your records, your spending per week, month and year, and a short written summary of your reading year. YOUR READING RECAP Share your reading year or month as an image: six templates, headline styles, reading time or pages, your covers and highlights. ADD BOOKS IN SECONDS Scan the ISBN barcode, search millions of books or add books by hand. Import your library from Goodreads, StoryGraph, Reado and other apps, genres and covers included. "Missing details" fills in page counts and publishers, and you can export your whole library as a .csv spreadsheet. AUTHORS AND LENDING Follow your favorite authors in several languages and get notified about new titles. Lending remembers who has which book, with a reminder to get it back, and borrowed books remember when you got them. YOUR DATA, YOUR CHOICE Keep everything 100% local on your device, or sync via iCloud or Google Drive. Export a complete backup at any time. PREMIUM: PAY ONCE, NO SUBSCRIPTION No ads, cloud sync, Insights, and your library in the browser on your computer at app.shelfbuddy.de, linked with a QR code, no account needed and encrypted on your device. One purchase, all future updates included. ON IPHONE, IPAD AND IPHONE DUO On iPad you work with a sidebar and the book page side by side. Optimized for iPhone Duo: unfolded, ShelfBuddy uses the large screen like a tablet. ALL YOURS Dark mode, selectable accent colors and available in four languages.
Underlined
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You underline as you read. Then the lines stay in the book, because typing one out is more work than it is worth in the moment. Underlined is a reading tracker built around getting them out. Photograph the page, draw a box round the passage, and it is yours. A PASSAGE WITHOUT TYPING IT • Photograph the page and draw a box round what you underlined. Nothing is retyped. • The box is coarse on purpose: it only has to contain the passage. The words are trimmed back to whole sentences, so a box that clips a few still gives a clean quotation. • The page number is read off the photograph, so keeping a line from page 214 moves your reading progress to 214. When it cannot be read, the app asks. • Text read off a page is never quietly corrected. A word that looks wrong is offered as a suggestion — against word lists carried on the phone, in twenty-six languages — and nothing changes until you say so. • Star the ones that matter. Add a thought underneath while it is still fresh. A SHELF IN ONE PHOTOGRAPH • Point the camera at a row of spines instead of typing forty titles. • Books standing up, books lying flat, a shelf shot at an angle, all without turning the picture. • A single cover works too, for the book in your hand. • Everything found is shown to you first. You choose which go on the shelf and which shelf. YOUR READING YEAR • One goal for the year, paced against how far into the year it actually is — not against a flat count. • Three shelves and no ceremony: want to read, reading, finished. Your TBR is just a shelf. • Keep the page you are on; the last page finishes the book on its own. • Write down how a book left you, in a sentence or two. • Statistics about reading, not about scores: passages kept this month, this year and all time; how many you starred; how long they run; books finished, by year. WHAT YOU KEEP COMES BACK • A passage resurfaces each day, from your own collection. • Search every line you ever kept, with your words marked where they were found. • The ones you return to rise: the app counts which passages you come back to. • Dig into a passage with a model that runs on your phone, never a server. (Recent iPhones.) • Read a passage in another language through Apple's own translation sheet. DISCOVER • Passages other readers underlined, narrowed by subject, in the languages you read. • Keep the ones that stay with you; they join your own shelf. • Find the book behind a line: what it is about, more by the author, books shelved beside it, and where to buy a copy. • Offer a passage of your own if you like — a button you press, never something the app does on its own. Anything can be reported and taken down. TAKE IT WITH YOU • Send a passage as a picture, set as a page rather than a screenshot. • Export one book's passages, or everything you have ever kept, as a PDF set at paperback size. YOUR LIBRARY STAYS YOURS • No account. Nothing to sign up for and nothing to sign in to. • Your books, your progress and your passages live on your phone. • The app does not upload your notes and it does not track you. • Eight languages in the app itself, and passages in twenty-six. • A colour for every book; paper by day, ink by night. FREE AND PRO Five books, free, with every feature working — the camera included. Keeping passages is free without limit and always will be: it is what the app is for. Underlined Pro opens the shelf to as many books as you keep. SUBSCRIPTION Underlined Pro is an auto-renewing subscription: $2.99 a month, or $19.99 a year. Payment is charged to your Apple Account at confirmation of purchase. It renews automatically unless turned off at least 24 hours before the period ends; manage or cancel it in your Apple Account settings. Privacy policy: https://www.threedollarclub.com/underlined/privacy.html Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Discover passages come from Wikiquote, used under CC BY-SA 4.0. Book information comes from Open Library.
Screenshots
Verdict
The clearest difference is ads: Underlined at none against ShelfBuddy's shown. ShelfBuddy's advantage is update cadence (every 3 days vs fortnightly) and device support (3 vs 1). On price and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. ShelfBuddy sells 1 one-off in-app purchase and Underlined sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.
ShelfBuddy ships an update every 3 days, Underlined fortnightly. The most recent releases landed on November 14, 2026 and November 10, 2026 respectively.
| Parameter | ShelfBuddy | Underlined |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (6 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 6 — better | — |
| Update frequency | Every 3 days — better | Fortnightly |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 58 MB | 24 MB |
| Age rating | 4+ | 4+ |
| Developer | JAN-HENNING BUNS | Mert Arman |
In-app purchases
ShelfBuddy
- ShelfBuddy Freischaltung$19.99
Underlined
- Underlined - Monthly$2.991 Month
- Underlined - Yearly$19.991 Year









